Pneumatic rivet bucker



April 9, 1929. w, R, HQDGES 1,708,300

PNEUMATI C RIVET BUCKER Filed May 6, 1926 Patented Apr. 9, 1929 UNITED STATES rinasce WILLIAM R. HOD'GES, OF EUPORA, MISSISSIPP.

PNEUMATIC BIVET BUCHE-R.

Application filed May 6, 1926.

This invention relates to an improved rivet bucker to be used to hold rivets in place during t-he riveting of the same.

The primary object of this invention is the provision of a pneumatic rivet bucker, embodying novel structural features, .which enables the same to be used with ease, and considerably less labor than the conventional manually operated bucker, for the. purpose of holding r'ivets during a riveting action..

A further object of this invention is the provision of a compact pneumatic rivet bucker, embodying an improved arrangement of parts which will best facilitate the riveting act-ion in confined quarters.

Other objects and advantages of this invent-ion will be apparent during the course of the following detailed description.

In the accompanying drawing, forming a part of this specification, and wherein similar reference characters designate Vcorresponding parts throughout the several views,

Figure 1 is a side elevation of the improved bucker, showing the same in place in a channel iron, for the purpose of holding a rivet, in a somewhat conlned space, during the riveting of the channel iron.

Figure 2 is a longitudinal cross sectional view taken thru theimproved pneumatically operated rivet bucker, showing cooperating details thereof. 4

Figure 3 is a top plan view of the improved rivet bucker. i

Figure 4 is a view somewhat similar to Figure l, but showing the manner in which the improved rivet bucker is adjustably used to adapt the same for various sizes of angle irons and the like.

In the drawing, wherein for the purpose of illustration is shown, only a preferred embodiment of this invention, the letter A may generally designate the improved rivet bucker, which is adapted to be used upon channel irons or like structural pieces, for the purpose of holding rivets C in place. Tl e improved rivet bucker 'A is of the pneumatic type, and embodies a cylinder D, within which a plunger construction E operates; a handle F being provided for holding the bucker A, and as a means to feed the fluid Serial No.V 107,223.

for operating the plunger E. The cylinder construction D is formed to detachably receive different sizes of stingers G, D and G, etc.

The cylinder D is preferably hollow cylindrical in formation, including the cylindrical body portion 10, having the plunger compartment 11 therein. At its upper edge the bodyA portion 10 is provided with an intur'ned annular slightly upwardly sloping plunger retaining flange 12, defining a downwardly facing shoulder 18 i fhich faces downwardly towards the compartment 11, the flange 12 being provided to deline a restricted passageway 14 axially aligning with the compartment 11, and thru which the plunger also operates. The cylinder body 10 is open at the lower' end thereof, being internally screw threaded at 16, for detachably receiving a base 17. The base 17 includes the reduced screw threaded shank or portion 19 adapted to be detachably threaded in the screw threaded opening 1G,and it alsoincludes a polygonal shaped wrench engaging head 20 adapted to lie below the lower edge of lthe cylinder" body 10, and to compress a gasket 21 against the body 10, to provide a leak proof connection between t-he base 17 and body 10. The cylinder 10 radially thereof is provided with a tubular boss 25, havinga screw threaded opening 2G therein which communicates with the compartment 11, justv above the top surface Q8 of the base v17, when the latter is in place to its maximum extent in the cylinder V10. rlhis screw Jdireaded opening 26 1s adapted to receive the Vscrew threaded end of the handle F, as will be subsequently described.

rlhe plunger construction E preferably includes the enlarged piston head slidable in the comlnutnient 11; and the plunger stem 37 connected ii'itegral with the head although Yof less diameter than the same, and slidable thru the opening lel at the upper end of the cylinder body 10. At the juncture of the stern 37 and piston head 35, a shoulder 88 is formed which is adapted to abut against the shoulder 1.3 of the cylinder 10, to limit the outward movement of the piston plunger E. The piston head 35 is preferably annularly grooved with any approved nurnber of grooves, adapted to receive piston rings 40, or analogous packing. The lower end of the piston is preferably provided with a reduced extension formed by tapering the piston head downwardly in a converging relation, so that when the piston head 38 seats upon the top surface 28 of theI base 17, an annular space 4:2 will be provided below the piston head 35, into which the fluid inay flow for the purpose of lifting the plunger within the cylinder.

At its upper end the plunger stem 37 is preferably provided with a reduced socket extension 45, which has therein a cupshaped recess 46, the axis of which is eccentric to the axis of the plunger E, and which inay be formed on any approved radius, the saine being adapted to receive the head of the rivet in the relation illustrated in Figure l of the drawing. If preferred, seine means may be provided upon the cylinder D to guide the action of the plunger E to a limited straight line movement, so that the center of the socket 46 is always disposed directly at the opposite side of the axis of the'nlunger D with respect to the handle F, since this is the position which the parts assume during a riveting action, in order to best adapt the tool for use in cramped and close quarters, as illustrated in Figures l and 4.

The base 17 inwardly of the bottoni surface thereof is provided with a screw threaded opening or socket 50, adapted to detachably receive the upper screw threaded end 52 of the stinger G. The stinger Gr may be made in any approved length, and various lengths of Stingers will have to be provided, all of which are provided with'the screw threaded end 52, or analogous means for detachably fitting in the socket 50.` In lieu of the screw threaded connection a bayonet slot connection, or any analogous approved nie-ans for connecting the '10er in the base niay be lvn'ovided. 'lhe sini;Y G at its lower end is Vpointed at 55, for digging into a structural part to be riveted. The screw threaded socket 50, and the axis ot' the stinger G are arranged eccentric to the axis of the plunger E, at the opposite side of the axis of the plunger E, with respect to the attachn-ient handle F. In fact, the axis of the stinger G aligns with the axis or center of the sockel. i6, ef the plunger, as is illustrated in the drawing, in order that the tool inay be practically used in close quarters.

Referring to the handle F, the saine includes a tubular body 60, which inay be of any approved construction, but which. preferably tapers from an enlarged diameter at its free end to a reduced diameter at "'f lr.; cylinder connected end. This body is provided with a duct 61 longitudinally therethrough, thru which the fluid, either air or liquid, inay flow to operate the improved tool. The handle at its cylinder connected end is provided with a screw threaded shank adapted to connect in the screw threaded opening 26 above mentioned, and at its free end the handle body 60 inav be provided with a reduced shank 63, for detachably receiving a flexible or other fluid conducting conduit 64, by means 65.

Transversely in the handle body 60, preferably adjacent the free end thereof, it is preferred to provide a valve seat opening 66, within which a regulating valve 67 is provided, of any approved type, having a suitable way therethrough for regulating the flow of the operating fluid along the Vpassageway 6l inte the cylinder. Between this valve 67 and the cylinder it is preferred to provide a release valve 70 of any approved construction, which .is provided for releasing the air or liquid pressure from the tool, after a bucking operation.

Freni the foregoing description of'this invention the operation will be apparent. While the tool is termed a. pneumatic tool, it is within the contemplation of the invention to utilize liquid as an operating medium. The handle body GO serves a dual function in providing for conduct-ion of the operating medium, and which the operator grasps'in order to handle the tool. This handle is arranged at right angles to the axis of the cylinder, and it may be conveniently operated as a consequence. As is illustrated in Figure l of the drawing, the tool may be practically used within the close quarters of a channel iron B, for the purpose of bucking the head 75, of a rivet C, during the riveting action. As is illustrated in Figures l, 2 and l, various sizes of stingers inay le applied, merely by detachment and attachment with respect to the base 17.

Various changes in the shape, size, and arrangement of parts may be made to the forni of invention herein shown and described, without departing frein the spirit of this invention or the scope of the clainis.

I claim:

l. As an article of niainlfactnre a. plunger for pneumatic rivet buckers comprising a piston portion of'c vliinlrical formation having one end thereof tapered on a decreasing 'diameter to a fiat surface,` the opposite end of the piston portion having a reduced .stein axially extending -therefroni7 the reduced stein at its free end havinga socket eccentricallv disposed with respect to the'axes of theA stern and piston portion'.

2. In a pneumatic rivet bucker the coinbination of a cylinder having a chamber therein, a piston slidable in said chamber having a stein extending from one end of the cylinder and provided with a socket therein, the opposite end of the cylinder having a base thereon, a stinger on said base, a handle having a duct connection with `the chamber of the cylinder immediately at the bottom of the cylinder substantially flush With the inside surface of the base facing the chamber, said piston havingr the end thereof facing the base beveled so that when the piston engages against the base there Will be an annular space in the chamber surrounding the bevel portion of the piston into which the duct communicates for admission of an operating fluid.

WILLIAM R. HODGES. 

